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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Fix flaky test test_tool_progress[server_transport1] in test_integration.py","articleBody":"### Initial Checks\n\n- [x] I confirm that I'm using the latest version of MCP Python SDK\n- [x] I confirm that I searched for my issue in https://github.com/modelcontextprotocol/python-sdk/issues before opening this issue\n\n### Description\n\nThe test `test_tool_progress[server_transport1]` is flaky. \n\n**CI evidence:** https://github.com/modelcontextprotocol/python-sdk/actions/runs/19267355169/job/55086335948?pr=1613\n\n**Test location:** `tests/server/fastmcp/test_integration.py`\n\n### Related Issues\n\n- #1141 (Progress notifications cause server to hang on stdio transport)\n- #1333 (`stdio_server` uses unbuffered memory streams which can cause server to block)\n\n### Python \u0026 MCP Python SDK\n\n```Text\nLatest SDK version\n```\n\n\u003csub\u003e[AI Disclaimer](https://gist.github.com/maxisbey/6123d132484e4c533eab519a2800693d)\u003c/sub\u003e","author":{"url":"https://github.com/maxisbey","@type":"Person","name":"maxisbey"},"datePublished":"2025-12-11T14:19:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1776/python-sdk/issues/1776"}